@book { GenerationenbeziehungimWandel,
    title = "Generationenbeziehung im Wandel?",
    author = "Martin {Grünendahl}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1092053"
}